Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Balance Sheet (Detail)

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Condensed Consolidating Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Current assets:        
Cash and cash equivalents $ 15,227 $ 12,245 $ 6,993 $ 4,512
Receivables:        
Oil and natural gas sales 85,221 97,733    
Joint interest and other 31,492 56,439    
Income taxes   47,884    
Total receivables 116,713 202,056    
Restricted cash and cash equivalents 16,459       
Prepaid expenses and other assets 32,850 25,822    
Total current assets 181,249 240,123    
Property and equipment – at cost:        
Oil and natural gas properties and equipment 7,120,086 6,694,510    
Furniture, fixtures and other 21,325 21,786    
Total property and equipment 7,141,411 6,716,296    
Less accumulated depreciation, depletion and amortization 4,950,768 4,655,841    
Net property and equipment 2,190,643 2,060,455    
Restricted deposits for asset retirement obligations 34,966 28,466    
Other assets 16,842 19,943    
Total assets 2,423,700 2,348,987    
Current liabilities:        
Accounts payable 129,988 123,885    
Undistributed oil and natural gas proceeds 41,278 37,073    
Asset retirement obligations 95,014 92,630    
Accrued liabilities 51,048 21,021    
Total current liabilities 317,328 274,609    
Long-term debt 1,052,984 1,087,611    
Asset retirement obligations, less current portion 267,093 291,423    
Deferred income taxes 177,404 145,249    
Other liabilities 15,859 8,908    
Shareholders’ equity:        
Common stock 1 1    
Additional paid-in capital 404,604 396,186    
Retained earnings 212,594 169,167    
Treasury stock, at cost (24,167) (24,167)    
Total shareholders’ equity 593,032 541,187    
Total liabilities and shareholders’ equity 2,423,700 2,348,987    
Parent Company
        
Current assets:        
Cash and cash equivalents 15,227 12,245 6,993 4,512
Receivables:        
Oil and natural gas sales 66,953 80,729    
Joint interest and other 31,492 56,439    
Income taxes   163,750    
Total receivables 98,445 300,918    
Restricted cash and cash equivalents 16,459      
Prepaid expenses and other assets 152,739 25,822    
Total current assets 282,870 338,985    
Property and equipment – at cost:        
Oil and natural gas properties and equipment 6,703,175 6,356,529    
Furniture, fixtures and other 21,325 21,786    
Total property and equipment 6,724,500 6,378,315    
Less accumulated depreciation, depletion and amortization 4,690,550 4,461,886    
Net property and equipment 2,033,950 1,916,429    
Restricted deposits for asset retirement obligations 34,966 28,466    
Other assets 481,029 442,540    
Total assets 2,832,815 2,726,420    
Current liabilities:        
Accounts payable 130,021 123,792    
Undistributed oil and natural gas proceeds 40,989 36,791    
Asset retirement obligations 95,014 92,595    
Accrued liabilities 45,272 20,755    
Total current liabilities 311,296 273,933    
Long-term debt 1,052,984 1,087,611    
Asset retirement obligations, less current portion 235,782 262,524    
Deferred income taxes 181,953 158,758    
Other liabilities 457,768 402,407    
Shareholders’ equity:        
Common stock 1 1    
Additional paid-in capital 404,604 396,186    
Retained earnings 212,594 169,167    
Treasury stock, at cost (24,167) (24,167)    
Total shareholders’ equity 593,032 541,187    
Total liabilities and shareholders’ equity 2,832,815 2,726,420    
Guarantor Subsidiaries
        
Receivables:        
Oil and natural gas sales 18,301 17,004    
Total receivables 18,301 17,004    
Prepaid expenses and other assets 3,991       
Total current assets 22,292 17,004    
Property and equipment – at cost:        
Oil and natural gas properties and equipment 416,911 337,981    
Total property and equipment 416,911 337,981    
Less accumulated depreciation, depletion and amortization 260,218 193,955    
Net property and equipment 156,693 144,026    
Deferred income taxes 4,549 13,509    
Other assets 441,908 393,499    
Total assets 625,442 568,038    
Current liabilities:        
Accounts payable   93    
Undistributed oil and natural gas proceeds 289 282    
Accrued liabilities 129,656 116,132    
Total current liabilities 129,945 116,507    
Asset retirement obligations, less current portion 31,311 28,934    
Shareholders’ equity:        
Additional paid-in capital 231,759 231,759    
Retained earnings 232,427 190,838    
Total shareholders’ equity 464,186 422,597    
Total liabilities and shareholders’ equity 625,442 568,038    
Eliminations
        
Receivables:        
Oil and natural gas sales (33)      
Income taxes   (115,866)    
Total receivables (33) (115,866)    
Prepaid expenses and other assets (123,880)       
Total current assets (123,913) (115,866)    
Property and equipment – at cost:        
Deferred income taxes (4,549) (13,509)    
Other assets (906,095) (816,096)    
Total assets (1,034,557) (945,471)    
Current liabilities:        
Accounts payable (33)      
Asset retirement obligations   35    
Accrued liabilities (123,880) (115,866)    
Total current liabilities (123,913) (115,831)    
Asset retirement obligations, less current portion   (35)    
Deferred income taxes (4,549) (13,509)    
Other liabilities (441,909) (393,499)    
Shareholders’ equity:        
Additional paid-in capital (231,759) (231,759)    
Retained earnings (232,427) (190,838)    
Total shareholders’ equity (464,186) (422,597)    
Total liabilities and shareholders’ equity $ (1,034,557) $ (945,471)